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Plasmonic vortices (PV) excited by a highly focused radially polarizedoptical vortex (RPOV) beam on a metal surface are investigated experimentallyand theoretically. The proposed method reveals a direct phase singularity andorbital angular momentum (OAM) transfer from an incident structured beam to itscounterpart in surface plasmon with dynamic, reconfigurable and high-efficiencyadvantages. The plasmonic field pattern, phase distributions, Poynting vectorand focusing efficiency of PV are studied in detail. Experimental verificationfurther shows that nanoparticles can be confined and manipulated within theregion of PV and orbital rotation speed of the trapped particles is altereddynamically by changing the topological charge of the incident light.

Plasmonic orbital angular momentum manipulation through light control